Def. pub.
method for extending the flask life of yafor-fiu.ed
electric discharge lamps



a or 1 DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Apr. 11. 1068. 849 0.0. 1221. [dentiflcation is by serial number 0! the application and the heading indicates the number of pages of specification including claims. and 0! sheets of drawing contained in the application as originally illed. The tile or this application is available to the public for inspection; reproduction may be purchased for '30 cents per sheet.

Applications published under the Defensive Publication Program have not been examined as to the merits of alleged invention. The Patent Ofllce makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED MAY 6, 1969 SUPPLY A method for extending the flash-life of vapor-filled electric discharge lamps which comp-rises exposing the lamps to ultraviolet radiation prior to and coincident with operation of the lamp. The ultraviolet radiation can be directed toward any portion of the lamps, but best results are obtained when the radiation is directed at the cathode.

y 1969 R. c. BAETZOLD DEF. Pua.

METHOD FOR EXTENDIRG THE FLASH LIFE OF VAPOR-FILLED ELECTRIC DISCHARGE LAMPS Filed Jun. 7. 1969 POWER SUPPLY MA l I3 I! I I 5 9 l 7 k x I J 1 ROGER C BAETZOLD INVENTOR.

A TTORNE Y 

